Papermaking machine



Feb- 4, w47. 1 HQRNBOSTEL Em.

PAIER MAKING MACHINE Filed April l, 1944 oppose the latter.

atented Feb.. i947 Lloyd Hornbostel and .i

Wis., assignors to Beloit liron Works, Beloit,

Wis., a' corporation of Wisconsin applic-atm april i, i944, serial No.529.20

(ci. ca -i9) 3 claims. i

This invention relates to a paper making machine of the Fourdrinier typefor` the manufacture of soft tissue paper, and'it is specificallydirected to the take-od or suction transfer roll assembly of suchmachine It is one of the principal objects of this invention to simplifythe construction of a suction transfer roll assembly for a paper makingmachine such as contemplated herein, andr to improve the efficiency,operation and'fdep'endability of such assembly.

This invention has for its object to provide a wider or increased rangeof functions over those heretofore usually assigned to and performed bythe suction transfer roll Vof a Fourdrinier paper making machine;

Another of theprincipal objects hereof resides i in providing positivemeans to prevent an unsupported longitudinal draw or pull upon the papersheet between the point of .its withdrawal from art after understandingthe construction and opthe formingl wire and its engagement by theinitial or first press roll assembly. This eectively overcomes anytendency to stretch or rupture the sheet while it is in transit.. M

it is a further object hereof to provide an al'-` rangement whereby theloop of the bottom felt is advanced or set aheadA to a position where itis proximate the suction transfer roll whereby it is brought into directopposition thereto for cooperation with the top felt and the paper sheetat the suction area of the transfer roll. vi A further object of` thisinvention is to provide a suction transfer roll that is adapted toperform a plurality of operations or dual functions such as the suckingof the paper sheet to the pick-up top felt from the forming wire, andthe holding or retaining 4 of the sheet on the top felt until it reachesthe bottom felt where said sheet will become interposed between the twofelts.v

Also it is an object hereof to provide a transfer assembly in a papermaking machine wherein spaced nips are defined with relation to thesuctiontransfer roll, the said nips being respectively between saidtransfer roll and. 1) the co1 :h roll in the wire loop, and (2) a rollupon which the loop of the bottom felt is trained.

In this connection the 'present invention aims to provide means foreffectively mounting the roll forthe bottom felt'loop preferably uponthe same support with the suction transfer roll to By reason of thisassemblyl .thef transfer roll will perform cooperative func- .tions withboth the top felt and the bottom felt.

Additional aimsand advantages ofy this invention will'be'apparent topersons skilled in the ed upon the columns l2, which colums have an3ohead support Il. The plunger rod .22 hasan eneration thereof from thefollowing description. It is preferred to practice this invention insubstantially the manner hereinafter described in detail and as moreparticularly pointed out in the claims. Reference is now made to theaccompanying drawing that forms a part lof this speciflcation, in which,

` The figure is a diagrammatic side elevation oi the transfer end of thepress section and the delivery end of the forming wire section of apaper making machine showing the instrumentalities of the presentinvention.

The delivery end of the forming wire 5 is formed in a loop by beingtrained upon the primary suction couch roll t and a second couch roll l.The primary suction couch roll has its trunnions journaled in uprightsarising from asuitable base 9, and the couch roll 'i has its trunnionsjournaled in brackets i@ upon the top of the base 9. `Above the deliveryend of the assembly just described, there is an overhead support il thatis mounted upon the tops ofy columns i2 that are spaced from the loopedend of the forming wire in the manner shown to provide an overhangingportion i3 of said overhead support. A

IThe initial or first press roll assembly is mountoiset shelf I6. Thispress roll assembly com prises a lower suction press roll that isyield'- ably opposed by the plain roll i6 to dene a nipl between [saidrolls. The trunnions of the lower suction Apress roll l5 are mounted insuitable bearings il-that are secured to and ari/sfrom the shelffl: "Thetrunnions of the plain press ro1l i6,arejournaled in bearings I8 carriedby intermediate portions of horizontal arms i9 that have their endsnearest the columns l2fu1crumed on pivots 2li.v The movableouter orffreeends of .the arms i9 are yieldably urgedl india downward directiontoward suction roll .i5 by a plunger assembly comprising a cylinder 2l.vand a plunger rod 22, the cylinder being carried by trunnions 23 in lugsor-ears 24 depending from the overlargement 2E from which trunnions-'26project horizontally 4and are engaged in bearings in the adjacent outerendsof the arms I9. `The super'- posed top and bottom felts 21 and 28respectively, with the 'intermediate paper' sheet ply, are trainedvthrough the nip defined by the suction 'press roll 'I5 and opposing rollIB. The suction transfer roll 29 -yieldably opposes the couch roll `'ltodefine, a nip through which the pick-up top felt 21 is trained in amanner so that it will contact the paper sheet while it is traveling onthe delivery end loop-of the wire. The trunnions of this transfer roll29 are journaled in bearings 30 in the outer ends of a suitable rockingframe. This rocking frame comprises supporting members SI of invertedl.- shape the lower ends of which are provided 'with trunnions 32 thatare movably mounted .in bearings 33'in suitable base blocks 34. Beyondthe bearings 30 for the suction `transfer roll trunnions, the L-shapedframe members 3l are provided with upwardly inclined arms 35 forrotatably supporting an idle roll 36 upon which the pick-up top felt 21is trained and from which the top felt travels to the nip dened by thesuction transfer roll and couch roll 1.

The upright portions of the frame members 8l have arms 37 pivotallymounted thereon by means of studs 33 and the outer movableportions ofthese arms 31 are provided with hearing brackets 39 for journaling aroll 40 upon which the cover or bottomfelt 2'8 is trained and from whichsaid bottom felt travels in an upwardly inclined dlrection to the nipdened by the iirst press roll assembly. This arrangement positions theroll 40 in opposition to the transfer roll 29 and disposes the loop ofthe bottom felt 28 close to but spaced from the 'delivery loop of theforming wire 5. The roll 40 is yieldably urged toward the suctiontransferroli by springs Si that are interposed between the outer ends ofthe roll supporting arms 31 and follower disks d2 upon the adjacent endsof threaded rods d that are screwed into internally threaded bosses onbrackets le and which may be turned by hand wheels to adjust the tensionof the springs di. The roll 48 and the suction transfer roll 29 which itopposes denne a suction nip that is spaced from the rst nip which isdened by the transfer roll 29 `and the couch roll 1. For convenience thetwo spaced nips are indicated by arrows on the couch roll 1 and bottomfelt roll Il! and they are identified respectively by the characters Aand B.

The assembly which is mounted upon and slipported by the L-shaped framemembers 3i is yieldably urged toward the couch roll 'i by a plunger B6operating in a cylinder d1 that has a pivotal mounting upon brackets d8on the upper portion of the frame members 3l. In this manner the suctiontransfer roll yieldably opposes the couch vroll 1, and vsaid transferroll is in turn 'yeldably opposed by the roll eil upon which the bottomfelt is trained, and there is only a short distance traversed by thetransferred paper sheet before it is covered by the bottom felt 28.Adjustable suspension rods 49 for the roll `29, used during feltchanging operations, have theirlower ends pivotally mounted in ears 50arising from convenient portions of the frame members 3|, the upper endsof said suspension rods being provided with elongated eyes 5l that areengaged with a rod 52 extending horizontally across the overhang portionof support H.

The suction area `of the transferroll 29 is of such dimension that Iitincludes both the nips A and B. The transfer roll 29 has a suctionpassageway 53 opposite the nip A to be effective thereat and there isanother passageway 54 that extends from alongside the rst passageway atleast to the second nip B. In this manner the suction area of transferroll 29 is divided into two areas, one of which is wider than the otherin its circumferential dimension. There is a control damper or flapvalve 55 in the passageway ll that The paper carried with the formingwire 5 A after leaving the primary suction couch roll ii has preferablybeen substantially dried, and when f the sheet reaches the nip A thehigh suction area of the transfer roll 29 will suck the paper at the nlpA onto the top felt 21 so 'that the sheet -will move along with this topfelt. The paper and top felt now reach the inuence of the lowv suctionarea of transfer roll 29 that will hold the paper against the top felt27 throughout the low suctionA area or until two plies meet the bottomfelt 28 at the nip B and cover the paper. From this location the paperwill be maintained bctween the two felts 21 and 2t in transit to thepress roll assembly l and i6. 'The effect of the suction on the paperand feit while spanning the lspace between the nips A and B is such thatthere is no pull upon the paper sheet. The paper sheet upon leaving thenip B will be interposed between the two felts to be supported and movedthereby to the first press assembly.

It will, of course, be understood that various details of constructionmay be varied through a wide range without departing from the principlesof this invention and it is, therefore, not the pur-I pose to limit thepatent granted'hereon otherwise than necessitated by the scope of theapn pended claims.

We claim as our invention: 1. -In a paper making machine having a loopedforming wire with a rst plain roll in the lp of the wire and a suctionroll preceding said first roll, a suction transfer roll opposing the rstroll 45 to define a first nip, means in said transfer roll providingadjacent high and low suction areas thereon, a second plain rollopposing said transfer roll to define a second nip spaced from said nrstnip, a pick up felt trained through said first 50 and second nips, acover felt trained through said second nip, the high suction area ofsaid transfer roll being constructed and arranged to suck a paper sheetfrom the wire tothe piclr` up felt adjacent said first nip,and the lowsuction 55 area of said transfer roll extending from said high suctionarea to the point; where said cover felt lies in juxta-position to saidpick up felt, the low suction area being constructed and arranged tosupport the paper sheet on the pick up fel-t 50 until engaged by saidcover felt.

2. In a paper making machine having a looped forming wire with a iirstplain roll in the loop of the wire, a suction' transfer roll opposingsaidv first roll to define a rst nip, means in said transfer rollproviding adjacent high and low suction Aareas thereon, a second plainroll opposing the transfer roll to define a second nip spaced from saidiirst nip, a pick up felt trained through said first and second nips, acover felt trained through 10 said second nip, the-high suction area. ofsaid transfer roll being constructed and arranged to suck a paper sheetfrom the wire to the pick up felt adjacent the nrstnip, and the lowsuction area of said transfer roll extending from said blah suction area.to said second nip, said low 5 suction area being constructed andarranged to support the paper sheet on said pick up feit until engagedby said cover teit in said second nip.

3. In a paper making machine having a looped forming wire and a firstroll in the loop of the wire,`a movable frame, a suction transfer rollon said frame, means urging said frame in. the direction to engage saidsuction transfer roll with said rst roll, thereby dening a rst nip, armsfulcrumed on said frame, a second roll carried by said arms, meansyieldably urging said arms to engage said second roll with said transferroll to dene a second nip, a bottom felt trained on said second roll andpassing through said second nip,

REFERENCES le of this patent:

Number a top felt passing through said rst and second 15 Number UNITEDSTATES PA Name Date Street Jan. 4., 19de Collins Feb. 5, 1929 Berry Jan.25, 1944 H111 Oct. 3, i939 Berry July 30, 1940 Millspaugh June 11,1194@FOREIGN PATENTS Country Date British Jan.l 26, i939 British 191i FrenchNov. 7, w89

